Proceedings Paper

In the field of telescope applications, it needs to adjust the focus to get clearer image of objects at different distance. Novel design of focus adjusting apparatus with long journey is presented here. This apparatus has long journey of second mirror extended to 20mm. And its adjusting precision is about 0.1μm. This apparatus can be controlled with two modes. One mode is manual control. The other mode is automatic control. The design can be applied to the fields of telescopes which needs long adjusting range and high precision.